CN1747354A - Time-frequency resource distribution of public pilot frequency - Google Patents
Time-frequency resource distribution of public pilot frequency Download PDFInfo
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Abstract
The method includes following steps: a) more than one time frequency patterns in public pilot channel are produced by code word of Reed-Solomon Code; b) the time frequency patterns are selected in each transmission time interval to assign time frequency resources in public pilot channel. The invention can be applied to OFDM whose frequency reuse factor is 1.
Description
Technical field
The present invention relates to the time-frequency resource allocating technology of OFDM communications (OFDM) system, particularly a kind of time frequency resource of public pilot channels distribution method of ofdm system.
Background technology
Wireless communication system, for example cellular radio Communication system utilizes the geographic area difference, realizes frequency reuse by dividing geographical different communication zone, to improve the capacity of wireless communication system.Each communication zone in the wireless communication system can be called as a sub-district (cell).When adopting the simple multiplexing factor to be the planning of one frequency resource, different cell adopt identical frequency, thereby work in can the phase mutual interference between the different cell signals of same frequency.The running time-frequency resource of ofdm system is divided into the narrow-band sub-carriers of some quadratures in frequency domain, user's data stream transmits on each subcarrier.Because the narrow-band characteristic of subcarrier can overcome multi-path influence, still keep the orthogonality between the subcarrier after the signal process multipath channel, thereby make that the interference between the internal user of sub-district is very little.
Denomination of invention is " Multiplexing scheme in a communication system ", the PCT application of application number PCT/04/000128 has provided the distribution method of time frequency resources of ofdm system Traffic Channel, to each transmission time interval (TTI), select frequency patterns to distribute to Traffic Channel at random according to the specific scrambler in sub-district, wherein distribute between the different frequency patterns of two sub-districts intersection point seldom.Adopt this method, if the frequency patterns of two sub-districts is almost completely overlapping in a TTI, then in next TTI, because the randomness of scrambler, almost completely overlapping probability is just very little.This method is applicable to that frequency re-use factor is one ofdm system, disturb under the less situation between the user in guaranteeing the sub-district, guaranteed that the interference that each user of current area is subjected to adjacent co-frequency cell is identical substantially, promptly disturbing is equalization, and, when the running time-frequency resource of the CU of adjacent co-frequency cell more after a little while, the adjacent co-frequency cell user's that the user of current area is subjected to interference is less.
In ofdm system, especially under frequency re-use factor is one situation, except considering the distribution method of time frequency resources of Traffic Channel, disturb beyond the equalization of less and interference between the Traffic Channel of assurance different districts, also need to consider the time frequency resource of public pilot channels assignment problem, guarantee between the Common Pilot Channel of different districts, disturb less between the Common Pilot Channel of different districts and the Traffic Channel and the interference equalization.The Common Pilot Channel of ofdm system is made up of the public guide frequency on the time-frequency plane, the signal of launching on these public guide frequencies is known, can be used for channel estimating, so the time frequency resource of public pilot channels distribution method to satisfy the demand of channel estimating, promptly satisfy two-dimentional sampling thheorem.The Common Pilot Channel of ofdm system can also be used to carrying out Cell searching and frame synchronization, so the time frequency resource of public pilot channels distribution method also needs to consider to satisfy the requirement of Cell searching and frame synchronization.
At Wavecom, " Different pilots shape distribution for OFDM blocks ", 3GPP TSG RAN WGl contribution R1-030679, New York, USA, August, 25
Th-29
ThProvide a kind of time frequency resource of public pilot channels distribution method in 2003, Common Pilot Channel is compared with Traffic Channel has higher power usually, and therefore requiring the Common Pilot Channel lattice point of two co-frequency cells that interfere with each other is nonoverlapping on time-frequency plane.This method has been avoided the interference between the pilot tone of the co-frequency cell that interferes with each other effectively.Because the common asynchronism(-nization) step between the base station of two sub-districts, therefore, when adopting this time frequency resource of public pilot channels distribution method, the pilot tone lattice point of the Common Pilot Channel of different districts is to realize by taking different subcarriers.When Common Pilot Channel takies 5% running time-frequency resource, when different districts adopted the public guide frequency of nonoverlapping square, then the frequency interval between the time-frequency lattice point of a Common Pilot Channel was at most 20 subcarriers, and 20 kinds of different pilot frequency modes are promptly arranged at most.When the frequency of the base station of two sub-districts has synchronous error, to consider also that then the frequency interval between the pilot tone lattice point of the Common Pilot Channel that adopts with different sub-district frequently is enough big, to overcome the error of Frequency Synchronization, cause the number of different pilot frequency modes further to reduce.
At Lucent, EP 1148673 A2, provide a kind of time frequency resource of public pilot channels distribution method that adopts latin square sequences in " Identification of a base station; usingLatin-square hopping sequence; in multicarrier spread-spectrum systems ", different districts adopts the latin square sequences of Different Slope to generate different Common Pilot Channel, can carry out Cell searching and frame synchronization by the detection to slope.No longer resemble the method for being narrated in " Differentpilots shape distribution for OFDM blocks " not overlappingly fully between the Common Pilot Channel of different districts, but a spot of intersection point is arranged.The Common Pilot Channel of Sheng Chenging can be under base station time and all nonsynchronous situation of frequency like this, and the intersection point between the Common Pilot Channel of maintenance Different Slope correspondence is less.But because Common Pilot Channel will take the fixing running time-frequency resource in sub-district, therefore different slope numbers is still limited, for example when the running time-frequency resource that takies 1/13,12 different public guide frequency patterns is only arranged.
Above-mentioned two kinds of time frequency resource of public pilot channels distribution methods by distributing different frequency patterns as Common Pilot Channel to the co-frequency cell that interferes with each other, have guaranteed that the interference ratio between the Common Pilot Channel between the sub-district is less.But, because the number of alternative different public guide frequency frequency patterns is fewer, thus need carry out the planning of careful public guide frequency frequency patterns during the network planning, like this, can bring difficulty to the network planning, be even more serious under one the situation particularly in frequency re-use factor.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of time frequency resource of public pilot channels distribution method, and this method can reduce difficulty of network planning, is specially adapted to frequency re-use factor and is one ofdm system.
According to above-mentioned purpose, concrete technical scheme of the present invention is achieved in that
A kind of time frequency resource of public pilot channels distribution method of orthogonal FDM communication system is characterized in that, this method comprises:
A, the code word that is produced by the Ruide Solomon code generate the frequency patterns of an above Common Pilot Channel;
B, in each transmission time interval, select the frequency patterns of Common Pilot Channel to carry out the distribution of time frequency resource of public pilot channels.
It is to belong to different after the frequency patterns elapsed time cyclic shift of any two Common Pilot Channel of the different districts that interferes with each other that step B selects the rule of the frequency patterns of Common Pilot Channel.
It is the regular picked at random specific according to the sub-district that step B selects the frequency patterns of Common Pilot Channel.
It is to select according to the specific pseudo random sequence in sub-district that step B selects the frequency patterns of Common Pilot Channel.
The described assigning process that carries out time frequency resource of public pilot channels of step B is: select a frequency patterns or a plurality of frequency patterns, realize the distribution of the time frequency resource of public pilot channels in the transmission time interval by the combination to the segment of the frequency patterns selected and frequency patterns.
(wherein, k is 2 or 3 or 4 for n, k) cyclic code, and the intersection point number between the corresponding different code words is 1 or 2 or 3 in the code word employing that the described Ruide of steps A Solomon code produces.
The frequency patterns of the described generation Common Pilot Channel of steps A, satisfying the subcarrier that the Common Pilot Channel lattice point on i the orthogonal FDM communication system symbol of Common Pilot Channel takies is jq+x (i), j=0,1, ..., wherein amount of bias x (i) is an i value of code word, j is the index of the lattice point of Common Pilot Channel, q is the interval of pilot tone on frequency, and i is the natural number more than or equal to 0.
The frequency patterns of the described generation Common Pilot Channel of steps A, the orthogonal FDM communication system symbol that satisfies i the subcarrier that Common Pilot Channel takies is jq+x (i), j=0,1, ..., wherein x (i) is an i value of code word, j is the index of the lattice point of Common Pilot Channel, q is pilot tone interval in time, and i is the natural number more than or equal to 0.
A kind of Common Pilot Channel of orthogonal FDM communication system and the distribution method of time frequency resources of Traffic Channel, this method comprises:
A, by sequence b
l k(n), n=0,1, ..., N-1 generates the frequency patterns of the Common Pilot Channel that is spaced apart q on the codomain, and q is a positive integer, N represents the length of sequence, and l represents different group numbers, k=0,1,2 .., q-1, different sequence in k represents one group, sequence difference does not on the same group have intersection point between same group the sequence;
B, in each transmission time interval, select the frequency patterns of Common Pilot Channel to distribute time frequency resource of public pilot channels;
C, tectonic sequence a
j i(n) q+b
l k(n), n=0,1,2 ..., N-1 forms the frequency patterns of Traffic Channel, wherein a by sequence
j i(n), n=0,1,2 ..., N-1, N are the length of sequence, and j represents the different group number of sequence, and i represents not have mutually in one group the numbering of the sequence of intersection point;
D, in each transmission time interval, select the running time-frequency resource of the frequency patterns distribution service channel of Traffic Channel.
A kind of time frequency resource of public pilot channels distribution method of orthogonal FDM communication system, this method comprises:
The frequency patterns of A, the more than one Common Pilot Channel of generation;
B, the rule specific according to the sub-district in each transmission time interval, select the frequency patterns of Common Pilot Channel to carry out the distribution of time frequency resource of public pilot channels at random.
Describedly be chosen as: select according to the pseudo random sequence that the sub-district is specific according to the specific rule in sub-district.
The described assigning process that carries out time frequency resource of public pilot channels of step B is: select a frequency patterns or a plurality of frequency patterns at random, realize the distribution of the time frequency resource of public pilot channels in the transmission time interval by the combination to the segment of the frequency patterns selected and frequency patterns.
From such scheme as can be seen, the present invention has provided the distribution method of Common Pilot Channel running time-frequency resource, and this method can reduce difficulty of network planning, is specially adapted to frequency re-use factor and is one ofdm system.Common Pilot Channel provided by the invention can make that interference ratio is less between the Common Pilot Channel of different districts, and the Traffic Channel and the interference between the Common Pilot Channel of different districts are also fewer.Common signal channel satisfies the requirement of channel estimating simultaneously.In addition, Common Pilot Channel of the present invention can also be used to carrying out Cell searching and frame synchronization.The method of selecting the frequency patterns of Common Pilot Channel as time frequency resource of public pilot channels at random provided by the invention, the easier planning of carrying out network.Accordingly, the present invention is in order to reduce the interference between Common Pilot Channel and the Traffic Channel, a kind of distribution method of time frequency resources of Traffic Channel further is provided, and Traffic Channel and the interference between the Common Pilot Channel provided by the invention of carrying out time-frequency resource allocating with this method are very little.
Description of drawings
Fig. 1 is the embodiment schematic diagram of the present invention to the frequency patterns of Common Pilot Channel distribution.
Fig. 2 is the present invention's another embodiment schematic diagram to the frequency patterns of Common Pilot Channel distribution.
Fig. 3 is an embodiment schematic diagram of the frequency patterns of the Traffic Channel of the corresponding Common Pilot Channel of the present invention.
Fig. 4 is another embodiment schematic diagram of the frequency patterns of the Traffic Channel of the corresponding Common Pilot Channel of the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is further elaborated.
The present invention adopts the Saloman, Ruide, and (RS, Reed-Solomon) code word obtains the frequency patterns of Common Pilot Channel.Especially, by the intersection point between the frequency patterns that increases different Common Pilot Channel a little, just can obtain the more frequency patterns of the Common Pilot Channel of more number.
At Stephen G.Wilson, " Digital modulation and coding ", Prentice-Hall, Inc, in 1996, definition is n=q for q unit length
m-1 basis BCH Bose-Chadhuri-Hocquengham (BCH) sign indicating number is the RS sign indicating number when m=1.In general q is the inferior power of a prime number.If α is a primitive element on the GF (q), multinomial
g(D)＝(D-α
j)(D-α
j+1)...(D-α
j+δ-2)
Be δ-1 time multinomial on the GF (q), the RS sign indicating number by this multinomial generate (n, k) cyclic code, wherein, n-k=δ-1.The RS sign indicating number is a minimum distance seperable code, i.e. minimum range d
Min=δ=n-k+1.
Work as k=1, during δ=n,
The RS code word be (0,0 ..., 0), (1,1 ..., 1), (2,2 ..., 2) ..., (n, n ..., n).There is not intersection point between any two code words.Code word number is q.
Work as k=2, during δ=n-1,
d
Min=n-1, therefore any two code words have only an intersection point at most.The number of code word is q
2
Give one example, work as n=5-1, α=3, k=2 makes j=1, then generator polynomial be (D-3) (D-4).Therefore the code word of correspondence comprises two parts during k=2, a part be (1,3,2,0), and (1,0,3,4) ... }, a part is the code word { (0,0,0,0), (1,1,1,1), (2,2,2,2), (3,3,3,3), (4,4,4,4) } of k=1 correspondence in addition.Because sign indicating number is a cyclic code, so the code word of k=2 correspondence is except the RS code word that repeats to generate of k=1 correspondence, other code word can be obtained by the circulation translation of a code word by the domain of definition and codomain.For example, can obtain by the domain of definition of (2,4,3,1) and the circulation translation of codomain.(2,4,3,1) then obtain (4,3,1,2) in domain of definition cocycle translation 1,, then obtain (3,0,4,2) in codomain cocycle translation 1.
Work as k=3, during δ=n-2,
d
Min=n-2, promptly any two code words have two intersection points at most.Code word number is q
3
Give one example, work as n=5-1, α=3, k=3 gets j=2, and then generator polynomial is D-4.Obviously, the code word that is generated by D-4 comprises all k=2, α=3, and the code word that (D-4) is generated by multinomial (D-3) of j=1 correspondence also comprises by generator polynomial (D-2) (D-4) (D-1) (D-4), (D-4) (D-4), the code word of D (D-4) generation.Notice codeword set that (D-2) (D-4) generate for (1,4,3,0), and (4,2,1,3) ... }, therefore be by (D-3) (D-4) the backward code word of generated codeword.
Further, can also get k=4,5 ..., any two code words in the corresponding codeword set have k-1 intersection point at most.Promptly, obtain the more code word of more number by relaxing the requirement of the intersection point number between the code word.Below, we utilize RS sign indicating number structure to distribute to the frequency patterns of Common Pilot Channel.
General, (x y), can have dual mode to be mapped to time-frequency lattice point on the two-dimentional time-frequency plane to a given two-dimensional coordinate.A kind of is that first dimension is a time coordinate, and second dimension is a frequency coordinate, and another is that first dimension is a frequency coordinate, and second dimension is a time coordinate.A chronomere can be an OFDM symbol, perhaps a plurality of OFDM symbols, and a cps can be a subcarrier, perhaps several subcarriers.
A RS code word can be mapped as the frequency patterns of distributing to a Common Pilot Channel, and the method for mapping is the coordinate that forms the time-frequency lattice point of Common Pilot Channel earlier, again coordinate is mapped as frequency patterns with above-mentioned two kinds of methods.In method 1, for a given codeword sequence x (i), i=0,1, ..., n-1 can construct Common Pilot Channel, and the serial number that makes Common Pilot Channel lattice point on i OFDM symbol of Common Pilot Channel take subcarrier is jq+x (i), j=0,1 ...
Wherein x (i) is an i value of given codeword sequence, and q is the interval of pilot tone on frequency, 0,1,2 ..., N is the serial number of all available subcarriers,
Expression is not more than the integer of the maximum of (N-x (i))/q.For example, the corresponding Common Pilot Channel of RS code word (1,4,3,0) shown in Fig. 1 grey lattice point, this moment q=5.
If in a TTI, carry the length of the OFDM symbol numbers of Common Pilot Channel lattice point less than codeword sequence, then fill with the segment of codeword sequence, finish time frequency resource of public pilot channels distribution in current TTI.Further, when the length of RS sequence surpasses the number of the OFDM symbol that pilot tone takies in the TTI, the present invention is not limited only to utilize the RS sequence to arrange the Common Pilot Channel lattice point in a TTI, can utilize a RS sequence to arrange the Common Pilot Channel lattice point in continuous TTI.
Surpass codeword sequence length n if in a TTI, carry the OFDM symbol numbers of Common Pilot Channel lattice point, then the OFDM symbol of the Common Pilot Channel lattice point of overage in order 0,1, ..., n-1, codeword sequence according to selected uses the same method and carries out the structure of frequency patterns, up to the time-frequency resource allocating of finishing a common signal channel in the TTI.As shown in Figure 1, can repeated using code word (1,4,3,0) structure OFDM symbolic label be pilot tone lattice point on 4,5,6,7.After a TTI finished, can in kind carry out other TTI.
In order to reduce the running time-frequency resource that Common Pilot Channel takies, can have between the OFDM symbol that public guide frequency takies at interval.For example, as shown in Figure 2,, can only on the OFDM of even-numbered symbol, distribute public guide frequency, in like manner, also can only on the OFDM of odd-numbered symbol, distribute pilot tone for RS code word (1,4,3,0).The gap size of pilot tone lattice point on time and frequency must satisfy the requirement of channel estimating.
Be the building method of another Common Pilot Channel below, promptly method 2.
For a given codeword sequence x (i), i=0,1 ..., n-1 can construct Common Pilot Channel, makes that the serial number of OFDM symbol of i subcarrier correspondence of Common Pilot Channel is jq+x (i), j=0, and 1 ...,
Wherein x (i) is an i value of given codeword sequence, and q is temporal interval, 0,1 ..., N is the numbering of the OFDM symbol in a TTI or one continuous period,
Expression is not more than the integer of the maximum of (N-x (i))/q.If the number of the OFDM subcarrier of carrying Common Pilot Channel lattice point is then distributed time frequency resource of public pilot channels with the segment of code word less than the length n of code word.If the number of the OFDM subcarrier of carrying Common Pilot Channel lattice point surpasses code word size n, then the OFDM subcarrier to remaining carrying Common Pilot Channel lattice point carries out serial number, according to selected codeword sequence, use the same method and carry out the structure of Common Pilot Channel, distribute up to finishing time frequency resource of public pilot channels.
Be that interference ratio between the Common Pilot Channel of example explanation the present invention structure is less with method 1.Each pilot tone lattice point that carries on the OFDM symbol of pilot tone lattice point is equally spaced, equally spaced pilot tone lattice point can have different amount of bias on the different OFDM symbols, suppose to be spaced apart q, then the equally spaced pilot tone lattice point amount of bias on each OFDM symbol can get { 0,1, ..., the element among the q-1}, amount of bias is determined by RS sign indicating number sequence.There is not intersection point between two groups of Common Pilot Channel lattice points of the different amount of bias correspondences on OFDM symbol.Therefore, the intersection point between the frequency patterns of two different RS code word correspondences is determined by the intersection point of two different RS code words.The frequency patterns of the Common Pilot Channel by RS code word design has guaranteed that the intersection point between the frequency patterns of Common Pilot Channel of corresponding different RS code word is fewer, and therefore the interference between is fewer.
The Traffic Channel of following surface construction and Common Pilot Channel compatibility when guaranteeing between the Common Pilot Channel that interference ratio is less, guarantees that the interference between Common Pilot Channel and the Traffic Channel is also fewer.Suppose existing sequence a
i j(n), n=0,1,2 ..., p-2, different (i, j) the different sequence of mark, b
k l(n), n=0,1,2 ..., p-2, b
k l(n) ∈ 0,1,2 ..., q-1} is the offset sequence of the Common Pilot Channel correspondence of q at interval, different (k, l) corresponding different sequence.A then
i j(n) q+b
k l(n) be the sequence of Traffic Channel correspondence of structure, n=0 wherein, 1,2 ..., p-2.
Sequence is mapped to frequency patterns, and two kinds of methods are also arranged usually.A kind of what be that the domain of definition of sequence represents is time dimension, and what codomain was represented is frequency dimension; What another was that the domain of definition of sequence represents is frequency dimension, and what codomain was represented is time dimension.Sequence a by the Traffic Channel correspondence
i j(n) q+b
k l(n), n=0,1,2 ..., the public guide frequency frequency patterns that the frequency patterns translation that p-2 generates generates with by b
k l(n), n=0,1,2 ..., p-2 is identical as the public guide frequency frequency patterns that amount of bias generates, if promptly x (n) is the frequency patterns that the sequence of a Traffic Channel generates, x (n) then, (x (n)+q) mod (pq), (x (n)+2q) mod (pq) ... be the frequency patterns of Common Pilot Channel.Be not difficult to find out that thus according to above-mentioned public guide frequency frequency patterns generating mode, the intersection point number between the different RS sequences is with corresponding in the intersection point number between the public guide frequency on the time-frequency plane.
Give one example, given sequence a (0), a (1) ..., a (p-2), then structure
Given b (0), b (1) ..., b (q-2), then structure
Wherein a (n) can select the Costas sequence, and b (n) can be the sequence of structure Common Pilot Channel correspondence, for example RS codeword sequence.For example, to p=23, q=5 chooses (5,2,10,4,20,8,17,16,11,9,22,18,21,13,19,3,15,6,7,12,14,1) as a (n), n=0, and 1,2 ..., 22, (2,4,3,1) are as b (n), n=0,1,2,3; To p=5, q=3 selects (2,4,3,1) as a (n), n=0, and 1,2,3, select (2,1) as b (n), n=0,1.
Twill lattice point among Fig. 3 has provided the Common Pilot Channel that is generated by (2,4,3,1) 3+ (2,1,2,1), and cross waves lattice point among Fig. 3 and grey lattice point have provided two Traffic Channels (2,4,3,1) 3+ (0,2,0,2), (2,4,3,1) 3+ (1,0,1,0).
As can be seen, sequence a
i l(n) q+b
k l(n), n=0,1,2 ..., p-2, b
k l(n) ∈ 0,1,2 ..., q-1} satisfies given (i k) travels through all j, and the sequence that l forms is formed one group, does not have intersection point between the sequence in a group, different (i, k) corresponding different group.Sequence character by the frequency patterns correspondence knows that (i, the intersection point between the frequency patterns of two Traffic Channels j) seldom to have different binary indexs.If (then the intersection point between the Common Pilot Channel of Sheng Chenging is also fewer for k, l) difference for the binary index.
Further, can illustrate that the interference of the Traffic Channel of certain user in certain sub-district and other district pilots interchannels is also less.Be without loss of generality, suppose that the Traffic Channel that user 1 uses in the A sub-district is generated by RS sequence r1 in the biasing of time-frequency plane, and the biasing of pilot channel on time-frequency plane generated by RS sequence r2 in the B sub-district.Select different r1 and r2, can guarantee that the time-frequency lattice point intersection point of r1 and r2 correspondence is less, and then guaranteed that the interference of the Traffic Channel of A community user 1 and B district pilots interchannel is less.
In addition, in order to reduce the running time-frequency resource that public guide frequency takies, the sequence that can also construct new Traffic Channel correspondence is a
l j(n) q+b
k l(n), n=0,1,2 ..., p-2, wherein a
l j(n) be a sequence, the Costas sequence of method one in the prior art for example, b
k l(n) can be spaced apart the codeword sequence c of the Common Pilot Channel correspondence of q by a codomain
k l(n) generate, promptly
This situation Common Pilot Channel generates x (n), (x (n)+q) mod (pq), (x (n)+2q) mod (pq) by the frequency patterns of following sequence correspondence, ..., n=0,2,4 ... perhaps x (n), (x (n)+q) mod (pq), (x (n)+2q) mod (pq) ..., n=1,3,5 ..., wherein x (n) is the sequence of a frequency patterns correspondence of the Traffic Channel of neotectonics.The pilot tone of Sheng Chenging and by sequence c like this
k l(n) distance on the domain of definition of generation is that 2 public guide frequency is identical.Gou Zao Traffic Channel and pilot channel satisfy business and the less and equalization of the interference between the pilot channel between the different districts like this.Usually, can be extended to Traffic Channel and the time frequency resource of public pilot channels distribution method that is spaced apart m.
As an example, Fig. 4 has provided the corresponding Common Pilot Channel of sequence (2,4,3,1) 3+ (2,1,1,0) of Traffic Channel, i.e. a frequency patterns (2,4,3, the 1) 3+ (0,2,2,1) of its middle twill lattice point and Traffic Channel, i.e. cross waves lattice point wherein.
What deserves to be explained is that the length of the RS sequence that adopts only is the convenience in order to describe in example.With method 1 is example, and usually, the running time-frequency resource that Common Pilot Channel takies has been determined the interval between a plurality of pilot tone lattice points on each OFDM symbol.The running time-frequency resource that Common Pilot Channel takies after a little while, then the interval between the pilot tone lattice point of each symbol is then big.The length of RS code word is by the interval determination between the pilot tone lattice point.Therefore what of the running time-frequency resource that is taken by Common Pilot Channel of RS code word size are determined.
The distribution method of the running time-frequency resource of Traffic Channel can adopt method of randomization of the prior art.For the distribution of the frequency patterns of Common Pilot Channel, also can adopt randomized method, promptly in each TTI, select the frequency patterns of public guide frequency according to specific regular change at random ground, sub-district, distribute the Common Pilot Channel of the current TTI of this sub-district.Change at random ground selection frequency patterns can be according to a pseudo random sequence that the sub-district is specific, for example many-valued scrambler sequence.The frequency patterns of alternative public guide frequency can be the set by the public guide frequency frequency patterns of RS sign indicating number generation, perhaps the subclass of the public guide frequency frequency patterns of RS sign indicating number generation.
In addition, all TTI that also can each sub-district select the frequency patterns of fixing public guide frequency to distribute time frequency resource of public pilot channels, and the different districts that interferes with each other is selected different frequency patterns.If the base station time of different districts is nonsynchronous, then the different public guide frequency frequency patterns of different districts selection can not be generated by temporal different translations.Adopt randomized method, because each the selection is at random, even this is overlapping fully, then next time, complete overlapping probability was considerably less, therefore went up the frequency patterns that translation produces by the time, also can distribute to different sub-districts.Like this, when adopting method of randomization, can be more than the number of the frequency patterns of different public guide frequencies for the different scrambling codes number of cell selecting, the therefore easier planning of carrying out network.Should be noted that, adopt randomized method can cause the public guide frequency frequency patterns of two different districts that certain probability that overlaps is fully arranged, but this probability can be by increasing public guide frequency the number of frequency patterns reduce, when two sub-district frequency patterns overlap cause disturbing very big, can't correctly separate timing, can overcome by error correction methods such as automatic repeat requests.
Frequency patterns for the Common Pilot Channel of distributing, because at time dimension or frequency dimension is equally spaced time-frequency lattice point, specifically, on that one dimension of the value correspondence of codeword sequence, be equally spaced promptly, therefore, can be at first on equally spaced this dimension, handle the time-frequency lattice point, interpolation for example, and then other one dimension carried out filtering.Thereby estimate the impulse response of the channel of all time-frequency lattice points.
Because the frequency patterns of different Common Pilot Channel is less at the time-frequency plane intersection point.Therefore, can mate with the frequency patterns of different Common Pilot Channel by the method for position probing, thereby identify different sub-districts, and detect frame head.
It may be noted that especially, can be on the basis of the distribution of the time frequency resource of public pilot channels that the present invention provides, other the running time-frequency resource of reallocating is given Common Pilot Channel.
The present invention provides ofdm system time frequency resource of public pilot channels distribution method, is specially adapted to frequency re-use factor and is one ofdm communication system.The present invention has guaranteed pilot channel and pilot channel between the different districts, disturbs less and equalization between pilot channel and the Traffic Channel.Simultaneously, the Common Pilot Channel of the present invention design can satisfy the requirement of channel estimating and Cell searching, frame synchronization.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1, a kind of time frequency resource of public pilot channels distribution method is characterized in that, this method comprises:
A, the code word that is produced by the Ruide Solomon code generate the frequency patterns of an above Common Pilot Channel;
B, in each transmission time interval, select the frequency patterns of Common Pilot Channel to carry out the distribution of time frequency resource of public pilot channels.
2, the method for claim 1 is characterized in that, it is to belong to different after the frequency patterns elapsed time cyclic shift of any two Common Pilot Channel of the different districts that interferes with each other that step B selects the rule of the frequency patterns of Common Pilot Channel.
3, the method for claim 1 is characterized in that, it is the regular picked at random specific according to the sub-district that step B selects the frequency patterns of Common Pilot Channel.
4, method as claimed in claim 3 is characterized in that, it is to select according to the specific pseudo random sequence in sub-district that step B selects the frequency patterns of Common Pilot Channel.
5, the method for claim 1, it is characterized in that, the described assigning process that carries out time frequency resource of public pilot channels of step B is: select a frequency patterns or a plurality of frequency patterns, realize the distribution of the time frequency resource of public pilot channels in the transmission time interval by the combination to the segment of the frequency patterns selected and frequency patterns.
6, the method for claim 1 is characterized in that, (wherein, k is 2 or 3 or 4 for n, k) cyclic code, and the intersection point number between the corresponding different code words is 1 or 2 or 3 in the code word employing that the described Ruide of steps A Solomon code produces.
7, the method for claim 1, it is characterized in that, the frequency patterns of the described generation Common Pilot Channel of steps A, satisfying the subcarrier that the Common Pilot Channel lattice point on i the orthogonal FDM communication system symbol of Common Pilot Channel takies is jq+x (i), j=0,1, ..., wherein amount of bias x (i) is an i value of code word, j is the index of the lattice point of Common Pilot Channel, q is the interval of pilot tone on frequency, and i is the natural number more than or equal to 0.
8, the method for claim 1, it is characterized in that, the frequency patterns of the described generation Common Pilot Channel of steps A, the orthogonal FDM communication system symbol that satisfies i the subcarrier that Common Pilot Channel takies is jq+x (i), j=0,1, ..., wherein x (i) is an i value of code word, j is the index of the lattice point of Common Pilot Channel, q is pilot tone interval in time, and i is the natural number more than or equal to 0.
9, the distribution method of time frequency resources of a kind of Common Pilot Channel and Traffic Channel is characterized in that, this method comprises:
A, by sequence b
l k(n), n=0,1, ..., N-1 generates the frequency patterns of the Common Pilot Channel that is spaced apart q on the codomain, and q is a positive integer, N represents the length of sequence, and l represents different group numbers, k=0,1,2 ..., q-1, different sequence in k represents one group, sequence difference does not on the same group have intersection point between same group the sequence;
B, in each transmission time interval, select the frequency patterns of Common Pilot Channel to distribute time frequency resource of public pilot channels;
C, tectonic sequence a
j i(n) q+b
l k(n), n=0,1,2 .., N-1 forms the frequency patterns of Traffic Channel, wherein a by sequence
j i(n), n=0,1,2 ..., N-1, N are the length of sequence, and j represents the different group number of sequence, and i represents not have mutually in one group the numbering of the sequence of intersection point;
D, in each transmission time interval, select the running time-frequency resource of the frequency patterns distribution service channel of Traffic Channel.
10, a kind of time frequency resource of public pilot channels distribution method is characterized in that, this method comprises:
The frequency patterns of A, the more than one Common Pilot Channel of generation;
B, the rule specific according to the sub-district in each transmission time interval, select the frequency patterns of Common Pilot Channel to carry out the distribution of time frequency resource of public pilot channels at random.
11, method as claimed in claim 10 is characterized in that, describedly is chosen as according to the specific rule in sub-district: select according to the pseudo random sequence that the sub-district is specific.
12, method as claimed in claim 10, it is characterized in that, the described assigning process that carries out time frequency resource of public pilot channels of step B is: select a frequency patterns or a plurality of frequency patterns at random, realize the distribution of the time frequency resource of public pilot channels in the transmission time interval by the combination to the segment of the frequency patterns selected and frequency patterns.
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